Vbox Cannot register the hard disk
Cannot register the hard disk '/media/Debian8.vdi' {d01efabc-aacf-4614-b29c} because a hard disk '/home/VirtualBox VMs/Debian/Debian8.vdi' with UUID {d01efabc-aacf-4614-b29} already exists.
This is what happens if you move the VDI to another location.
The easiest way is to delete/remove the machine from VBOX and then reimport it from the new location.
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